Improvement in ventilating- millstones



@uiten tata gutem @ffice IMPROVEMENT III vENTILATINe MILLSTOIIES.

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TO ALL WHOM IT MAY CONCERN:

Beit known that I, JOHN GRAY, of Dubuque, in the county of Dubuque, and State of Iowa, have invented a-newfand improved Flour-Cooler and Condycpse; and I do hereby declare that the/following is a full, clear, and exact description thereof, whihhvwillweiiable othcirs skilled in the art to make/:md use the same, reference being had to the accompanying drawings, forming part of this specication', in which- Figure 1 is a vertical section of my invention, taken in the line am, iig. 2.

Figure 2, a top View.

Similar letters of reference indicate like parts.

This invention relates to a new and useful improvement in apparatus for cpoling ilour and thestones `ofa mill when grinding, and condensing the moist vapors or `steam which are genelztedhiitheprocess ofgrinding grain; and it consists in cont'ihgwa"Mfaiilblower with a pair of millstones `in such manner that the hot air i shall be drawn from the curb er case after it has passed between the stones when grinding, while a current of fresh air is drawn through the eye with the grain. Provision is also mad-e for condensing the vapor or steam produced in grinding.

It has always been the study ofrmillers to grind, as cool as possible, Aand various devices have been employed for effecting this object.V The vapor or steam which arises mord or less, acchrdingto the quality of grain, in the process of grinding, is very prejudicial to thc quality of the flour when it condeuses in it, gathering about the burralrdmthhpmcurb, and'blogging the bpltingelpths" with moisture, andnat the same time imparting a bluish "I dirydelor to the flour mwhen condensed in giieat quantity. The lileatgenerated in as well as theinoistm ure ofmthe condensed steam, also interferes with the packing Aof the flour,` and renders it liable to fernientation.`

Bymin'ylimprovedmnietliod of exhausting the air from the curbs after it has passed between the stones all the heated ai nd steam are withdrawn as rapidly as they are produced, and a current of cool air is constantly Hitlietones and the iiour while grinding, keeping both `at-alow temperature, and extracting all the'moisture. By this means the quality of the flour is not only much improved, but the stones work better and grind faster,.heing aided by the current of air passing between them to discharge more easily. The iiour is discharged dry, and does not gather about the curb, nor clog the bolts, andrbeing cool, it can" be packed quickly, and without danger of spoiling. Therelis also a considerable saying effected in fine ilour, and the 'mill is not choked with iiour dust tothe injury of the health of millers.

A represents 'a pair of millstones, surrounded as usual by a cui-bha, `The runner B is provided with two' long wing'sggwipers, b b, placed on opposite sides of the periphery, and sloping back from the top to the bottom the same Way that ths-tone runs to throw therfiner dust of iloundownward. Two pipes or-spouts, C C, more or less, lead from the'upper side of the curb a, being let in at abohhte-ightriches from the peripheryltoma `longf"" square wooden-.box or conding-trunk, D, located at any convenient point in the mill, at and over one end of which hoxllamcpdganfan-blowerfwhieh-has a dischargpjgout, F leading outside of the .millto the open ,M air. The fan-blower E is operated by suitable connectioiivith -theih'aehinery of the milltogiveit high VelocityM"-` add a owerLsction capa `ty, which is regulated according -to the velocity of the millstones by' meansfof,

sliding valves c plac'ednat t entrance lof the spouts C C into the condenser D, by which the strength of the current of air drawn between the stones is perfectlyadju'stecl aswrequired, andthe grindingl process is thus 'i kept completely under the control of the miller. The top of the runner -is made smooth and flat at or near t fan-blower E through thebdndenser D, and finally discharged outside dfth and aroundthe eye, and on the inside of the curb is fastened a sheep-skin valve, e, with the'wool pressed down upon the stone sufficiently to stop the passage of air freely, in order that the current of fresh air entering the eye shall all pass down between the stones', and @11011iQILpJELQGQPfblOwer shall operate only o n airwhich has thus passed thrppghtgestpgesandjmmrbgtghp drawn up through theuspogtsfCC by the A e-uiill through'the spout F. The condenser D has. discharge-spouts QQ 12de? themendaandablock or siveep,rg, ii`tte d inside, which wmay* be drawn back and forth from one erid to the other by cordslt that pass through the ends of the box, in Order to clean it occasionally of the matters deposited by the condensatio'rrotlieA steam, anduswecp them' into the dachngtmeeff im Having thus described myinvention, what I claim therein ns new, end desire to secure by Letters Patent, is

y n 1. The fan-blower E, arranged in relation with the box D-, constructed as described, spouts C C, and millstnnes', asherein set'forth for the purpose specified.

, 2.A'lhe box D, constructed as described, provided with the discherge-sponts G at each end, and yharing v the cleaning-sweep g, operated by means of the cord L, as herein set forth forv the purpose specified.

3. The oblong box D,` inclined spouts C, and fen-blower Eznrrnnged in relation with eneh other and with v the lmillstcme, Aas/herein set fertli for the purpose specified.

The aboire specification of my' invention signed by me this 18th dey of February, 1867.

l JOHN GRAY.

Witnesses:

JOHN YB. LONGUEVILLE,

THos. A. MeCARRoN. 

